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A system loses 300 J of heat to the surroundings and does a work of 1200 J. Change in internal energy during the process is

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-900 J

-1500 J

+900 J

+1500 J

answer is B.

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Detailed Solution

Heat liberated by the system= -ve;

Workdone by the system = -ve;

Change in internal energy $(∆ E)$ = - 300 J - 1200 J = -1500 J

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